Plant Damage / Signs:
Insect feeding occurs inside the leaf tissue
Irregular shaped tan blotches develop on leaves
Often entire tree turns brown
Insect / Signs:
Black fly-like adults, 1/16" long, occur very early
Larvae flat, inside leaf
Insect, adult or larvae seldom seen
Related Problems:
Elm Leafminer - Elm
European Alder Leafminer - Alder
Hawthorn Leafminer - Hawthorn
Sycamore Leafmining Sawfly - Western Sycamore
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Plants:
Birch (primarily paper and gray)
Timing:
Spring / Summer
Generations / Year
2 - 4
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